Return-Path: Received: from relay04.roc.ny.frontiernet.net ([66.133.182.167] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 767809 for flyrotary@lancaironline.net; Wed, 02 Mar 2005 23:47:09 -0500 Received-SPF: pass receiver=logan.com; client-ip=66.133.182.167; envelope-from=canarder@frontiernet.net Received: from filter04.roc.ny.frontiernet.net (filter04.roc.ny.frontiernet.net [66.133.183.71]) by relay04.roc.ny.frontiernet.net (Postfix) with ESMTP id CFDED358059 for ; Thu, 3 Mar 2005 04:46:24 +0000 (UTC) Received: from relay04.roc.ny.frontiernet.net ([66.133.182.167]) by filter04.roc.ny.frontiernet.net (filter04.roc.ny.frontiernet.net [66.133.183.71]) (amavisd-new, port 10024) with LMTP id 15252-17-57 for ; Thu, 3 Mar 2005 04:46:24 +0000 (UTC) Received: from [127.0.0.1] (67-137-89-39.dsl2.cok.tn.frontiernet.net [67.137.89.39]) by relay04.roc.ny.frontiernet.net (Postfix) with ESMTP id 33BA535807D for ; Thu, 3 Mar 2005 04:46:23 +0000 (UTC) Message-ID: <42269696.3050405@frontiernet.net> Date: Wed, 02 Mar 2005 22:46:14 -0600 From: Jim Sower User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040514 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: EWP showdown References: In-Reply-To: Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit X-Antivirus: avast! (VPS 0509-3, 03/01/2005), Outbound message X-Antivirus-Status: Clean X-Virus-Scanned: by amavisd-new-20040701 (2.0) at filter04.roc.ny.frontiernet.net I was hoping to use them like fuel pumps - both for takeoff and landing, one or the other enroute ...

Russell Duffy wrote:

Message
<... would give me 3 pumps in series ...>
Why do they have to be in series? Don't ANY of these folks make a
viable check valve?

It's just the easiest way to do the test. BTW, I was reviewing some old EWP posts today, and noticed that Bob tested his pumps in series, and parallel, and found that series had a higher flow rate. That might be specific to his pumps, rather than a general rule, but the point was that parallel isn't necessarily better.

Cheers,

Rusty (can't parallel park either)